quirks

From: void <void_at_f-m.fm>
Date: Sat, 11 Mar 2023 15:43:20 UTC
Hello hackers@

What are 'quirks', how are they applied, why, where can I read 
up about them, are they documented?

I have a failing disk, this gets displayed in the console:

kernel: umass2:  SCSI over Bulk-Only; quirks = 0xc105

tia,
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